Use the REGRESSION feature on a graphing calculator.
-Efficiency experts rate employees according to job performance and attitude.The results for several randomly selected employees are given below. 
Find the regression line which can be used to predict performance rating if attitude rating is known.
Definitions:
Role Construct Repertory
A psychological tool used to help individuals identify how they construe significant persons in their lives, revealing their personal construct systems.
Validity
The degree to which an idea, conclusion, or measurement is grounded in reality and probably reflects the actual state of affairs accurately.
Repertory Grid
A technique used in personal construct psychology to explore the ways in which individuals construe their experiences and people in their lives.
Constructs
Abstract concepts developed or constructed to understand or interpret the world.
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